摘要
为分析路基上CRTS Ⅱ型板式无砟轨道轨道板开裂对车辆和无砟轨道结构的影响,根据弹性地基梁理论、有限元方法和轮轨系统耦合动力学理论,建立了弹性地基梁体的有限元模型和车辆-轨道-路基垂向耦合振动模型.采用大型有限元软件ANSYS/LS-DYNA,分析了轨道板开裂对轨道结构的静、动力学性能和行车性能的影响.分析结果表明:轨道板开裂对轨道结构受力的影响较小,不影响行车的平稳性和安全性;随列车速度增大和轨道板开裂,均会增大轮轨作用力和轨道结构的动力响应;在裂缝地段,应采取减振、隔振、控制轨道几何不平顺等措施降低轨道结构的动力响应;轨道板开裂将影响无砟轨道的耐久性和使用寿命,应及时修补.
In order to analyze the influences of cracking of CRTS （China railway track system） Ⅱ slab track on subgrade on a vehicle and ballastless track, a finite element model for beam body on an elastic foundation and a vertical coupling dynamical model for a vehicle-track-subgrade system were established on the basis of the elastic foundation beam theory, the finite element method and the wheel-rail coupling dynamics theory. ANSYS/LS-DYNA, a large finite element software, was used to analyze the static and dynamic properties of track and the stability of a train under track slab cracking. The analysis results show that track slab cracking has less effect on the stress of track and has no effect on the stability and security of a train. With increase of train speed and cracking of track slab, the wheel-rail force and the dynamic responses of track become bigger, so vibration reduction or vibration isolation and control measures of the track geometric irregularity should be adopted to reduce the dynamic responses of track in the crack area. The cracking of track slab has effects on the durability and lifetime of ballastless track, so it should be repaired in time.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2012年第6期929-934,共6页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(51008258)
铁道部科技研究开发计划资助项目(2010G006-B)
关键词
裂缝
CRTS
Ⅱ型板式轨道
力学性能
动力响应
crack CRTS （China railway track system） Ⅱ slab track mechanical property dynamic response
